Engine.



No. 669,290. Patented Mar. 5, 1901. F. STUER.

ENGINE.

(Application filed June 22, 1900.) I (No Model.) 2 Sheets-Sheet l.

No. 669,290. Patentd Mar. 5, won.

F. srosn.

ENGINE.

(Application filed June 22, 1900. (No Model.) 2 Sheets-$haet 2.

w: wowms PETERS 00.. moiourfia. wAsmNaYoM, q z; I

UNITED STATES PATENT OFFICE.

FREDRIOK STOER, OF ST. LOUIS, MISSOURI.

ENGINE.

- SPECIFICATION forming part of Letters Patent No. 669,290, dated March5, 1901.

Application filed June 22, 1900. Serial No. 21,246. (No model.)

To all whom it may concern.-

Be it known that I, FREDRIOK STOER, a citizen of the United States,residing in the city of St. Louis, State of Missouri, have inventedcertain new and useful Improvements in Engines, of which the followingis a full, clear, and exact description, reference being had to theaccompanying drawings, forming part of this specification.

My invention relates to an engine that may be constructed of small sizeand is suitable for use in furnishing power for automobiles, smallboats, or other apparatus requiring but limited power for theiroperation.

The invention consists in features of novelty hereinafter fullydescribed, and pointed out in the claims.

Figure I is a longitudinal sectional view of the engine. Fig. II is adetail view of the inlet-valve housing. Fig. III is a detail view of theinlet-valve housing, taken from a position approximately at right anglesto that seen in Fig. II. Fig. IV is a face view of the inner end of oneof the engine-cylinder members. Fig. Vis a view of the starting andreversing device and brake. Fig. VI is a detail view in elevation of theparts shown in Fig.V, one of the disks and a part of the other beingomitted. Fig. VII is an edge view of the starting, reversing, or brakelever.

I have shown in detail and will describe but one end of the engine; butit will be understood that the opposite end is of the same construction,and the mechanism operates similarly at the undescribed end to the onedescribed.

The cylinder is composed of two hollow members at, having their inneropposing ends flanged and joined together by couplingscrews inserted inthe flanges.

a is a bearing-box for the crank-shaft d, one half of the box beingformed upon one of the members a and the other half upon the othermember of the cylinder. One of the cylinder members is provided with abase a, upon which the cylinder is supported and held.

I) b designate the two heads of the piston, which are connected byacentral portion having a slot 6, through which an oil-pipe to enters tothe interior of the piston from the exterior of the engine-cylinder. bis a slot also in the central portion of the piston, in which thecrank-shaft cl revolves as it turns in the reciprocation of the piston.These slots b and b are indicated by dotted lines, Fig. I. The oil-pipeu extends to the interior of the piston and serves to deliver lubricantto all of the interior working parts of the engine. m representspacking-rings seated in the piston-heads b. The crank-shaft disconnected to the piston by a coupling 0, that is joined by aconnecting-pin w to a knuckle-joint e, seated in one of the heads of thepiston, as seen in Fig. I.

f designates a housing seated in the end of the cylinder and closed atits outer end bya recessed plug 70. Within the housing f is avalve-chamber f, that contains the inletvalve g and into which thepressure medium is introduced through an inlet-opening 1). (See Fig. IIIand dotted lines, Fig. I.)

h is a pawl pivotally connected to the inner end of the valve-housingfand having an arm h, extending across the inner end of the inlet-valveg, and an arm 77. extending in the opposite direction.

21 designates a cushion plunger loosely seated in the end of thecylinder and extending into the cylinder-chamber, where it normallyrests against the arm k of the pawl h. The head of the plunger 11 islocated in a cushion-chamber 00, that is closed by a screwplug j andreceives pressure medium from the valve-chamber f through acom municat--ing duct f Z designatesa hook carried by the enginepiston and seated inthe head thereof. This hook is designed to engage the arm h of the pawl71. each time that the piston returns toward the inlet-valve and unseatsaid valve for the admission of pressure medium to the cylinder-chamber.As the piston approaches the end of the cylinder the hook Zpasses thepawl-arm h and after completing its stroke begins the return stroke. Asthe piston moves back the hook I catches the point of the pawl-arm h andcarries it therewith, consequently throwing the arm h inwardly againstthe inlet-valve g, moving said valve from its seat, and permitting theadmission of pressure medium from the valve-chamber f to thecylinder-chamber. The hook Z retains engagement with the pawl it untilthe piston has moved approximately one-third of its stroke and thecrank-shaft (l is a little past a dead-center. The pawl is then releasedby the hook moving away from it, the remainder of the stroke of thepiston being accomplished by the expansion of the pressure medium in thecylinder and the inlet-valve 9 being closed by the pressure mediumwithin the valve-chain ber f. As the inlet-valve closes the pawl-arm his carried inwardly and the arm 71, is thrown in the opposite directionand strikes against the inner end of the cushion-plunger 2', which iscushioned by the pressure medium flowing into the cushion-chamber :0,thereby providing for the return of the parts to their former positionswithout jar or sudden impact, that would occasion undue wear.

n designates the exhaust-valve housing, and 0 the exhaust-valve carriedby the valve, rod 19, which extends into the piston-head b nearest theexhaust-valve and plays loosely in a bushing 19, inserted in the piston.

s s are two nuts carried by the valve-rod p at its inner end andarranged to move within a sleeve (1, that abuts against the bushing 19'.When in the operation of the engine the piston has traveledapproximately four-fifths of its stroke, the nuts 5 come against theinner end of the bushing 19, in which the valve-rod slides, and thecontinued movement of the piston causes the valve-rod to be opened forthe escape of pressure medium on the return stroke of the piston.Between the sleeves g, at each end of the piston, and the inner ends ofthe nuts 8, upon the valve-rods at the opposite ends of the engine, is acushion-chamber 25, and loosely arranged in this chamber is a plunger r,that receives pressure medium entering into the chamber p past thevalverod and nuts 3. This plunger is designed to act against thepressure medium that has entered from the opposite side and carries theexhaustvalve to its seat upon the return stroke of the piston.

The engine herein described is intended for use in pairs in the samemanner as marine engines aroused, the crank-shafts of the two enginesbeing arranged at right angles to each other, so as to avoid theoccurrence of deadcenters in either.

In Figs. V to VII, inclusive, I have shown a starting and reversing orbrake mechanism, which will now be described. a designates a diskrigidly mounted on the crank-shaft cl. b is a sliding disk mounted onthe crankshaft d and held from turning thereon by a feather. (Shown bydotted lines in Fig. V.)

' The disk b is held toward the disk a by a spiral spring 2, backed by acollar y, rigidly keyed to the crank-shaft. e is a yoke suitablysupported in a position between the disks referred to. d is a leverpivoted to the yoke e and having applied thereto a pair of wedgeplates darranged to be moved into a position between the disks ta and b When itis desired to start the engine or to reverse the rotation of thecrank-shaft d, the lever (:Z is moved to carry the wedge-plates d into aposition between the disks a and 6*. On forcing the wedge-plates intosuch position the sliding disk b moves outwardly, and the frictionalengagement between the wedge plates and the disks causes the disks andthe crank-shaft by which they are carried to be rotated a sufficientdistance to carry the piston to a position at the end of either stroke,when the inlet-valve will be opened and pressure medium introduced intothe cylinderchamber to start or reverse the engine, as desired.

When the engine is in operation and it is desired to break its momentum,the lever d is moved into the position described for start ing andreversing the engine, and the wedgeplates by frictional contact with thedisks (0 and b produce a braking action to retard the rotation of thecrank-shaft d.

I claim as my invention 1. In an engine, the combination with a cylinderand piston arranged to operate therein; of an inlet-valve, a pawladapted to press against said valve and means carried by said pistonarranged to engage said pawl and unseat said valve, substantially asdescribed.

2. In an engine, the combination with acylinder and piston arranged tooperate therein; of an inlet-valve, a pawl adapted to press against saidvalve, and a hook carried by said piston adapted to engage said pawl andunseat said valve, substantially as described.

3. In an engine, the combination with a cylinder and piston arranged tooperate therein; of an inlet-valve, a pawl arranged to press againstsaid valve, means carried by said piston adapted to engage said pawl,and a cushion-plunger located in the rear of said pawl, substantially asdescribed.

4. In an engine, the combination with a cylinder and piston arranged tooperate therein; of an inlet-valve, a valve-housing, a cushionplungerhaving the head thereof arranged in a cushion-chamber provided withcommunication from the valve-chamber, a pawl adapted to press againstsaid inlet-valve, and a hook carried by said piston arranged to engagesaid pawl and unseat said valve, substantially as described.

5. In an engine, the combination with a cylinder and piston arranged tooperate therein; of an exhaust-valve; a valve-rod by which said valve iscarried and by which it is connected to said piston, a sleeve in saidpiston, and a nut carried by the end of said rod within said sleeve,substantially as described.

6. In an engine, the combination with a cylinder and piston arranged tooperate therein; of an exhaust-valve, a rod by which said valve iscarried and by which it is connected to said piston, a nut on the innerend of said rod, a sleeve in which said nut is arranged to operate, anda plunger loosely arranged in said piston adapted to play therein,substantially as and for the purpose setforth.

7. In an engine, the combination of a cylinder, an inlet-valve in saidcylinder, a piston, means carried by said piston whereby said valve isunseated on the stroke of said piston, and means located exterior ofsaid cylinder by which said piston is moved to unseat said valve instarting or reversing the action of the engine, substantially asdescribed.

8. In an engine, the combination of a cylinder, an inlet-valve in saidcylinder, a piston, means carried by said piston whereby said valve isunseated during the stroke of said piston, a crank-shaft connected tosaid piston, and means carried by said crank-shaft exterior of saidcylinder by which said piston is moved to unseat said inlet-valve instarting or reversing the action of the engine, substantially asdescribed.

9. In an engine, the combination of a cylinder, inlet-valves arranged insaid cylinder at each end thereof, a piston, and means whereby saidvalves are unseated on the movement of the piston in a direction awayfrom either of said valves, substantially as described.

10. In an engine,the combination of a cylinder, inlet-valves arranged insaid cylinder at each end thereof, a piston, means arranged to moveagainst said valves to unseat them, and means carried by said pistonadapted to engage and trip said valve-nnseating means, substantially asdescribed.

In testimony that I claim the foregoing I have set my hand this 1st dayof June, A. D. 1900.

FREDRIOK STOER.

Witnesses:

M. A. SEED, G. S. Moonv.

